Knowing that his beloved moon elves were waiting for him, Luis didn't hesitate to prepare to go back to Woodrill City. If there is something that he realized during his short stay in the Redhill territory, then it is the fact the preparation was easy, but saying goodbye was hard. The folks of the metal clan helped him every step of the way, from preparing the steel that would be used for the construction to the local foods and products that Luis would take as souvenirs. The folks from the metal clans ensured that nothing would give him the hassle.
But that doesn't mean they wanted him to leave. In fact, Luis could read in their eyes and the subtle hesitation in their action that they wanted him to stay, but he knew that that wouldn't be ideal, knowing that others needed him as the Moon Elf Lord.
That's why Luis asked them if they wanted to be involved in building the infrastructure in the Redhill territory, and to no surprise, they agreed.